#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main() {
    int a;
    while (scanf("%d", &a) != EOF) {
        if (a > 0)
            printf("1\n");
        if (a == 0)
            printf("0.5\n");
        if (a < 0)
            printf("0\n");
    }
    return 0;
}